/****************************************************************************
 *
 * Copyright 2016 Samsung Electronics All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
 * either express or implied. See the License for the specific
 * language governing permissions and limitations under the License.
 *
 ****************************************************************************/
/****************************************************************************
 * kernel/signal/sig_mqnotempty.c
 *
 *   Copyright (C) 2007-2009, 2013 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <gnutt@nuttx.org>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name NuttX nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 ****************************************************************************/

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include <tinyara/config.h>
#include <tinyara/compiler.h>

#include <signal.h>
#include <sched.h>
#include <errno.h>
#include <debug.h>

#include "sched/sched.h"
#include "signal/signal.h"

/****************************************************************************
 * Definitions
 ****************************************************************************/

/****************************************************************************
 * Private Type Declarations
 ****************************************************************************/

/****************************************************************************
 * Global Variables
 ****************************************************************************/

/****************************************************************************
 * Private Variables
 ****************************************************************************/

/****************************************************************************
 * Private Functionss
 ****************************************************************************/

/****************************************************************************
 * Public Functions
 ****************************************************************************/

/****************************************************************************
 * Name: sig_mqnotempty
 *
 * Description:
 *   This function is equivalent to sigqueue(), but supports the messaging
 *   system's requirement to signal a task when a message queue becomes
 *   non-empty.  It is identical to sigqueue(), except that it sets the
 *   si_code field in the siginfo structure to SI_MESGQ rather than SI_QUEUE.
 *
 ****************************************************************************/

#ifdef CONFIG_CAN_PASS_STRUCTS
int sig_mqnotempty(int pid, int signo, union sigval value)
#else
int sig_mqnotempty(int pid, int signo, void *sival_ptr)
#endif
{
#ifdef CONFIG_SCHED_HAVE_PARENT
	FAR struct tcb_s *rtcb = this_task();
#endif
	siginfo_t info;
	int ret;

#ifdef CONFIG_CAN_PASS_STRUCTS
	svdbg("pid=%p signo=%d value=%d\n", pid, signo, value.sival_int);
#else
	svdbg("pid=%p signo=%d sival_ptr=%p\n", pid, signo, sival_ptr);
#endif

	/* Verify that we can perform the signalling operation */

	if (!GOOD_SIGNO(signo)) {
		return -EINVAL;
	}

	/* Create the siginfo structure */

	info.si_signo = signo;
	info.si_code = SI_MESGQ;
#ifdef CONFIG_CAN_PASS_STRUCTS
	info.si_value = value;
#else
	info.si_value.sival_ptr = sival_ptr;
#endif
#ifdef CONFIG_SCHED_HAVE_PARENT
	info.si_pid = rtcb->pid;
	info.si_status = OK;
#endif

	/* Process the receipt of the signal */

	sched_lock();
	ret = sig_dispatch(pid, &info);
	sched_unlock();

	return ret;
}
